Molding apparatus.



o.y P. PAEHLKB.

MOLDING APPARATUS.

APPLIUATION FILED DBO.3,1909.

966,762. Patented Aug. 9,1910.

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O. P. PABHLKB.

MOLDING APPARATUS. APPLIGATION FILED Dno.3,19o9.

966,762. Patented Aug.9,191o;

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OTTO F. PAEHLKE, OF CLEVELAND, OI-IIO.`

MOLDING APPARATUS.

ySpecification of Letters Patent. Patented Aug'. 9, 1910.

Application filed December 3, 1909. Serial No. 531,168.

To all whom it may concern:

Be it known that I, OTTO F. PAEr-ILKE, citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Molding A paratus, ofwhich the following is a speci l cation.

My invention relates to improvements in molding apparatus, and theimprovement consists in the combination of parts, substantially asherein shown and described and more particularly pointed out in theclaims.

My object is to take conditions in the foundry as I find them andfurnish the melder with a device wherewith he can do better work andsave time and labor on each and every job regardless of the run of thedays work. By this last I mean that patterns of all kinds and shapes andsizes may be handled as they come and that only one mold, or many, maybe made from a single pattern with economy and despatch and withoutspecial preparation. To this end, I provide a set of devices adapted tobe detachably and adj ustably secured to molders patterns to eoperatewith the ordinary melders flasks in general use, and wherewith thepattern may be steadied and guided when withdrawn from the mold toprevent distortion or breaking down of the mold.

In the accompanying drawings, Figure l is a sectional view of a flaskand mold and pattern substantially completed and as it appears beforethe cope is lifted and removed, and Fig. 2 is a similar view of the sameparts without t-he cope. Fig. 3 is a sectional view of the lower half ofthe flask and mold with my improved steady-pins attached to the patternand in position to guide the pattern for removal, the dotted linesshowing the pattern in raised position. Fig. 4 is a sectional view ofthe flask and lnold complete without the pattern and ready for castingoperations. Fig. 5 is a perspective view of the lower half of the flaskand mold with the pattern therein and showing my improved devicesoperatively connected therewith. Figs. 6, 7 and 8 are perspective viewsof one form of steady-pin, thumb screws and screw plate, respectively,as sold to the trade.

As shown, my invention comprises two or more right angledmembers A,which may properly be referred to as steady-pins in view of theirfunction and purpose. Each member consists of a flat arm 2 having alongitudinal slot 3 at one end and an integral stem 4: at right anglesat its other end. Stem l is round, triangular, square or of any suitablecross section and relatively of less length than arm 2. However, as tothe length of these parts no particular limitation is intended, but forgeneral use a length of twelve inches for arm 2 and ten inches for stemt is suilicient to meet the average requirements in a foundry. When inuse, arms 2 overlap the top end edges of the lower half or so-calleddrag 5 of the flask B and rest flush upon or freely above the mold C andpattern D when the upper half or so called cope of the flask is removed.Stem et is placed at the outside of the flask and projects through or isslidably confined within open lugs or keepers 7, such as are alwaysfound at the ends of one part of flask B. Keepers 7 also cosact with andslidably hold the fixed pins 8 on the other part of the flask to keepthese parts in matching relation during the making of the mold andduring casting operations thereafter and they also serve to steady thecope or upper flask part when removed and replaced. Now, every foundry,especially where floor work is done, has a large assortment of flasks ofvarious dimensions to meet varying needs in making molds, and inpractice no larger flask is used than any given pattern on moldrequires. This invariably brings the tern close to the edge of theflask, especially at opposite ends thereof, whether the job be large orsmall, and permits the use of my steady-pins A with the lugs 7 of anyflask of ordinary construction and without change in either the flask orpattern. However, a plate or set of plates 9 are preferably suppliedwhich may be fastened upon, or inset into the pattern, or upon itsrapping board, by screws l0 or otherwise, and this fastening may betemporary or permanent and be placed where most convenient for attachingSteady-pins A. To thislatter end, each plate 9 is provided with a screwhole l1 to receive a thumb screw 12 which is of a size patto lthroughslot 3 of arm 2. By slotting said arm, no great care need be exercisedin placing plates 9`upon the pattern, as all va-A riation in distanceand alinement between the pattern and the end of the flask may beadjustably taken up by. the accommodation afforded to thumb-screws 12within said slot. Again, after tamping of the cope part of the mold andwhen the level of the pattern may have lowered somewhat in respect tothe original parting line as often occurs, I can introduce metal washersW of any suitable thickness between arms l and plate 9 to make a rigidattachment for steady-pins A. This adaptation of the device brings outan important point of difference between my invention and all othermolding apparatus or attachments known to me, to wit,-that with mydevice a melder is enabled to attach and detach the same from thepattern without altering the flask or the mold and without having saiddevice take any part or place in the making of the mold until thepattern is to be withdrawn. Thus my steady-pins for the pattern are notsubjected to tamping operations during the making of the mold, nor arethey embedded in the mold or in the top edges of the flask, but areabsolutely free therefrom, and therefore may be attached and detachedwithout danger of distorting or breaking down the mold and causing theneed of after building up or repairs thereon.

In practice, my steady-pins are attached after the mold has beencompletely tamped in both cope and drag and after the cope has beenremoved. They do not form supports for the pattern during tampingoperations as this is objectionable for the reason that when the cope istamped there is always great liability of the pattern and mold in thedrag to settle and if the attachments A were in place at this time, aslight spring or yield would result which would distort or enlarge themold. A spring or shift in the patterndue to tamping, causes the mold tobreak down or crumble here or there, or if this does not actually occur,a change or distortion would still be the result to the detriment of themold and the final casting.

I avoid all the foregoing objections by construeting my improvedattachment as hereinbefore described and by using the same as follows:Following usual practices and well known methods I first build up themold to the form shown in Fig. 1, wherein the cope or upper half offlask B is ready for removal from the lower half. The cope beingremoved, the next step is to withdraw the pattern, always a delicatetask, especially when the mold is of large size and because the usualpractice is to place the more difficult work in the drag. Thereforegreat care and skill must be required in this operation, otherwise themold will be distorted, changed, or broken down, thus occasioning lossof time and exacting laborE to repair the mold. To meet the emergency, Inow place my steady-pins A inthe' open lugs or keeper 7 on the lowerflask, and firmly fasten arms 4 to the pattern by thumb screws 12, usingwashers W between screw plates 9 and arms l if the pattern has settledduring previous tamping operations. This being done, steady-pins A maynow be regarded as fixed and rigid parts of the pattern. Screw eyes 15are also usually screwed into the pattern at this time to lift thepattern from the mold, and in a large pattern four screw eyes are used,two at each end. The pattern is now raised slowly and carefully, rappingof the pattern proceeding also as usual. Steady-pins A now guide andhold the pattern to a fixed vertical travel and prevent accidentalshifting of the pattern and obviously greatly facilitate the making of aperfect mold. Vhen the pattern is finally withdrawn and laid aside, thecope is replaced, other foundry practices perhaps being performed in then'leantime. The steady-pins A are now detached, and the pattern againused for :mother lnold if desired, but in no event do steady-pins Aremain on the pattern during any part of the molding operations exceptfor the brief interval when the pattern is withdrawn.

Fig. G represents a slight modification of the steady pin member andparticularly in the portion indicated by t', which is substantially Vshape in cross section.

What I claim is:

1. A molders flask having lugs at its ends, and a pattern, incombination with a set of steady-pins comprising right angled membershaving adjustable and detachable connections with said pattern andhaving stem portions to slidably engage said lugs.

2. A divided flask having pins and keepers therefor on its respectiveparts, and a pattern, in combination with right angled members havingadjustable and detachable fastening connections for said pattern andhaving projecting stems adapted to slidably cngage within said keepers.

8. A molders flask having steady-pin lugs thereon, and a pattern havingdetachable plates, in combination with right angled steady-pin membershaving detachable fastening connections for said plates and pattern andconstructed with stems to sldably engage said flask lugs.

4f. A molders flask having steady-pin lugs thereon, and a pattern havingfastening plates for steady-pins, in combination with a set ofsteady-pins having slotted arms and right angled stems, and thumb screwsto fasten said steady-pins to said plates and pattern.

5. As an article of manufacture and sale, an attachable and detachabledevice for safeguarding molds during withdrawal of pateeefree Q terne.cnprsng a right angled member, to detachably fasten said. slotted arms'rg an attachable pattern plate, and a clamping idly to the pattern. 10device for said member and plate. In testimony whereof I aHiX mysignature 6. An attachable and detachable device n presence of twoWitnesses.

for safeguarding molds during Withdrawal OTTO F. PAEHLKE.

of patterns, comprising steady-pin :members Witnesses: having slettedarms and fixed stems at right F. C. MUSSUN, angles thereto, combinedwith thumbserevvs E. M. FISHER.

